Dr. John Victor Gahagan, MD

Dr. Gahagan practices at Oncology Infusion Pleasanton - Cancer Clinic - HOPD in Pleasanton, California.

Dr. Gahagan's NPI, 1558629493, was assigned on April 29, 2012. Dr. Gahagan graduated from Wake Forest School of Medicine in 2012. Dr. Gahagan holds California license A126753.

Dr. Gahagan's primary practice is Oncology Infusion Pleasanton - Cancer Clinic - HOPD, at 5725 W Las Positas Blvd, Pleasanton, CA 94588.

Dr. Gahagan's primary practice is Oncology Infusion Pleasanton - Cancer Clinic - HOPD in Pleasanton, California. Dr. Gahagan is also affiliated with Stanford Health Care Tri-Valley. The medical group on file is Stanford Health Care. Dmand AI also links Dr. Gahagan to 1 more hospital, 2 group practices and clinics and 2 medical groups, each named with a free account.

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Gahagan practices, 5 sites in all. Vendor and product names are available with a free account.

Surgery is Dr. Gahagan's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Gahagan is board certified in colon & rectal surgery by the American Board of Colon and Rectal Surgery. Dmand AI has Dr. Gahagan's licenses on file in 2 states: California and New York.

Dmand AI lists abdominal hernia repair surgery, acute gallbladder or bile duct inflammation, colonoscopy, colon removal, gallbladder removal, gastrointestinal bleeding and hemorrhoids among the conditions Dr. Gahagan treats.

CMS data shows 354 Medicare services from Dr. Gahagan across 9 procedure codes in 2024, for 211 Medicare patients. Medicare paid $39,023 for them.

CMS counts 211 Medicare patients who saw Dr. Gahagan in 2024. The largest group is 75 to 84, with 91 patients. 75% of them have high blood pressure, and 74% have high cholesterol. 23% are also on Medicaid. Their average risk score is 1.60, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Gahagan's median patient age at 58, with 46% women.

In 2024, Dr. Gahagan wrote 46 Medicare Part D claims for 37 patients. 80% of them were for generic drugs. CMS names the drug for 24 of them, across 1 drug with 11 or more claims each, at $1,529 in total drug cost. In 2023, CMS named 39 claims across 3 drugs.

Dr. Gahagan accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Gahagan as offering telehealth. CMS counts 34 procedures of colonoscopy by Dr. Gahagan, more than 56% of the clinicians it reports for that procedure.

Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)

Dmand AI links 15 papers to Dr. Gahagan, published from 2015 to 2025. 2016 was the busiest year, with 3. The most frequent topics are Adenocarcinoma, Neoadjuvant Therapy and Rectal Neoplasms. Dr. Gahagan has published most often in Am Surg. Dr. Gahagan's most frequent co-authors are Matthew D. Whealon, MD, Alessio Pigazzi, MD and Michael John Phelan, MD.

CMS Open Payments shows 20 general payments to Dr. Gahagan from 6 drug and device companies from 2016 to 2023. Education make up the largest share, 64% of the total. Intuitive Surgical, Inc. paid the most, $5,180.

Dr. Gahagan graduated from Wake Forest School of Medicine in 2012. Dr. Gahagan is a member of ACS and ASCRS.

Dr. Gahagan is in network with 10 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. PPO plans come from the most carriers, 6. Check the plan with the practice before a visit.